Hey there,
I can build a web interface, login protected, where you can upload csv files with the data to add/update/delete. I've been using this approach on ecommerce websites to bulk add/update/delete products. Each csv row corresponds to a row in your mysql table and it will have trigger (insert/update/delete).
Cost: 200 AUD.
Time required: 5 days at most.
Message me.
Regards, Calin.